#ifndef __MY_UTIL__
#define __MY_UTIL__
#include <iostream>
#include <fstream>
#include <string>
#include <vector>
#include <experimental/filesystem>
#include <sys/stat.h>


namespace cloud
{
    namespace fs = std::experimental::filesystem;
    class FileUtil
    {
    public:
        FileUtil(const std::string &filename) : _filename(filename)
        {
        }
        size_t FileSize()
        {
            struct stat st;
            if (stat(_filename.c_str(), &st) < 0)
            {
                std::cout << "get file size failed!\n";
                return 0;
            }
            return st.st_size;
        }

        time_t LastMTime()
        {
            struct stat st;
            if (stat(_filename.c_str(), &st) < 0)
            {
                std::cout << "get file modify time failed!\n";
                return -1;
            }
            return st.st_mtime;
        }

        time_t LastATime()
        {
            struct stat st;
            if (stat(_filename.c_str(), &st) < 0)
            {
                std::cout << "get file access time failed!\n";
                return -1;
            }
            return st.st_atime;
        }

        std::string FileName()
        {
            size_t pos = _filename.find_last_of("\\");
            if (pos == std::string::npos)
            {
                return _filename;
            }
            // return fs::path(filename).filename().string();
            return _filename.substr(pos + 1);
        }

        bool GetPosLen(std::string *body, size_t pos, size_t len)
        {
            size_t fsize = this->FileSize();
            if (pos + len > fsize)
            {
                std::cout << "pos + len > file size!\n";
                return false;
            }
            std::ifstream ifs;
            ifs.open(_filename, std::ios::binary);
            if (ifs.is_open() == false)
            {
                std::cout << "read open file failed!\n";
                return false;
            }
            ifs.seekg(pos, std::ios::beg);
            body->resize(len);
            ifs.read(&(*body)[0], len);
            if (ifs.good() == false)
            {
                std::cout << "get file content failed!\n";
                ifs.close();
                return false;
            }
            ifs.close();
            return true;
        }

        bool GetContent(std::string *body)
        {
            size_t fsize = this->FileSize();
            return GetPosLen(body, 0, fsize);
        }

        bool SetContent(const std::string &body)
        {
            std::ofstream ofs;
            ofs.open(_filename, std::ios::binary);
            if (ofs.is_open() == false)
            {
                std::cout << "write open file failed!\n";
                return false;
            }
            ofs.write(&body[0], body.size());
            if (ofs.good() == false)
            {
                std::cout << "write file content failed!\n";
                ofs.close();
                return false;
            }
            ofs.close();
            return true;
           }

        bool Exists()
        {
            return fs::exists(_filename);
        }

        bool CreateDirectory()
        {
            if (this->Exists())
            {
                return true;
            }
            return fs::create_directories(_filename);
        }

        bool ScanDirectory(std::vector<std::string> *array)
        {
            this->CreateDirectory();
            for (auto &p : fs::directory_iterator(_filename))
            {
                if (fs::is_directory(p) == true)
                {
                    continue;
                }
                array->push_back(fs::path(p).relative_path().string());
            }
            return true;
        }

        bool Remove()
        {
            if (this->Exists() == false)
            {
                return true;
            }
            remove(_filename.c_str());
            return true;
        }

    private:
        std::string _filename;
    };

}

#endif